Angular 2/4 communication between two component via a shared service

Question

I am trying to build a simple shopping cart application. I have two components and a cart service like following.

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Answer 1

In the header, you must subscribe to some event in the Shared Service. The same event will be emitted from your cart component.

Please have a look at this plunkr https://plnkr.co/edit/LS1uqB?p=preview